Recent research on an effect initially demonstrated in crickets shows that the so-called “Duke of Marlborough” effect extends to primates. The effect essentially demonstrates that males having recently won a fight against other males are both more likely to and more successful in courting females. The good part: the effect gained its name from an entry in the diary of the first Duchess of Marlborough, which reads: “His Grace returned from the wars today and pleasured me twice in his topboots.”